Disk wheel



' March 2 126v vC-E. H, FORSYTH DISK WHEEL Filed may 4. 1922 v I Jnde '7' 6 607 Patented Mar. 2, 1926.

UNITED STATES PATENT orrlcs."

GEORGE I'll. FORSYTH, OF CHICAGO, ILLINOIS, ASSIGNOR TO MOTOR WHEEL CORPORA- TION, OF LANSING, MICHIGAN,

A CORPORATION OF MICHIGAN.

:msK WHEEL.

Application filed May 4,

To all whom it may concern:

Be it known that I, GEORGE E. FoRsrTH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Disk Wheels, of which the following is a specification.

The present invention has to do with disk wheel construction and particularly with the strengthening of the disk forming the wheel body against not only radial but also lateral stresses. The greatest stress to which an automobile wheel is subjected is not due to the dead weight of the car body and its load, but rather to bad roads and unskillful driving. These may be grouped in one of two classes,the radial blows received when the wheel strikes an obstruction in the line of travel or drops into a hole, and the lateral stress resulting when the wheel strikes an object at an oblique angle and is driven or parked on a side hill.

Th primary feature of the inventlon is the strengthening of the disk intermediate the rim and its bearing upon the hub, by means of annularly spaced pockets, depressions or corrugations of substantial depth, and preferably byy a secondary supporting disk which may or not carry such depressions, the secondary disk spaced from the primary-disk inthe hub zone and bearing against the primary disk outwardly beyond the hub zone.

Two embodiments of the invention are set forth in the accompanying drawing by way of exemplification, the figures of the drawing being taken from my application Serial No. 264,253, filed November 26, 191.8, the said parent application having matured into Patent No. 1,373,184, dated March 29, 1921.

In the drawing,

Figs. 1 and 2 represent radial sectionsthrough disk wheels of slightly difierent construction but both embodying the invention.

Having particular reference to Fig. 1 of the drawing (corresponding to Fig. 8 of my parent application) the reference numeral the shoulder 17 and with its upper edge bears against and supports the front edge of the rim 20.

A secondary disk 22 is similarly secured to the hub and inthe hub zone is spaced from the primary disk 11 and extends in its main portion radially to the periphery where its margin is housed within the lipped over portion 23 of the primary disk. At annularly spaced intervals, outwardly beyond the hub zone, the secondary disk is provided with depressions 24 having their bottoms aligned in parallel relatioh to the primary disk at 25, hearing against the same in lateral supporting relation. In this bearing area the two dlsks may be secured together by the clip securing bolts 26 or they may be spot welded. Outwardly beyond the contact area 25 the outer wall of the pocket depression extends laterally beneath and in radial supporting contact with the telly portion 18 of the primary disk 11, as indicated at 27.

As shown in Fig. 2 of the drawing (corresponding to Fig. 13' of the parent. application) the primary disk 30, shouldered at 31 to support the rim-retaining member 21, extends rearwardly beyond said shoulder to substantially the median plane of the wheel,

and thence forwardly at 32 beneath the rim 20.

The secondary disk 33 is spaced from the primary disk adjacent the hub, whereas outwardly beyond the hub zone and in the area indicated at 34 the two disks are disposed in lateral supporting contact, being aligned in parallel relation, where they may or not be rigidly joined as by spot welding. Between thehub and rim the secondary disk 33 is provided with annularly distributed pocket-like depressions 35 abrupt at the one end 36 and at the other end 37 mer ing gradually into the general plane of the isk. In both forms 0 construction shown the secondary disk, being spaced from the main disk at the hub and in contact therewith outwardly beyond the hub zone, constitutes an efficient lateral support for the primary disk and are fixedly connected there with or otherwise clipped against radial shifting, also supports the disk against radial stresses.

It will beobserved that in both of'thc forms of construction shown the depressions or corrugations are pocket-like, of substantial depth, and comparatively short, differing in this respect from attenuated corrugations made to simulate spokes and as sometimes resorted to for stiffening Ihe precise location of the depressions and their exact conformation will depend upon the particular cross-sectional contour of the wheel and any auxiliary reinforcements em ployed. They may be disposed nearer the hub than the rim, or mid-way, or adjacent the periphery as here shown, depending upon the disk contour and the presence or absence of hub supporting members such as the hub plate or brake drum.

- I claim:

1. In a wheel of the class described, a main supporting front disk and a secondary reinforcing rear disk, the two disks aligned together in the region immediately outside of the hub zone, and the secondary or reinforcing disk having stifl'ening relatively short corrugations disposed annularly at intervals between the hub and rim.

2. In a disk wheel, a hub having radial flanges, a main front disk, and a reinforcing rear disk, the two disks in lateral support ing contact outwardly beyond the hub zone while spaced apart adjacent the hub and confined between the hub flanges, the rear disk provided adjacent its periphery with annularl spaced relatively short stiffening corrugations.

In testimony whereof I have hereunto subscribed my name.

GEORGE H. FORSYTH. 

